Boreal and temperate forests had higher MNC and FNC/BNC than other forest biomes.Mixed forests had higher MNC and lower FNC/BNC than other forest types.The dependence of MNC on forest type varied among forest biomes.M...Boreal and temperate forests had higher MNC and FNC/BNC than other forest biomes.Mixed forests had higher MNC and lower FNC/BNC than other forest types.The dependence of MNC on forest type varied among forest biomes.MAT and soil total N were the important factors on MNC and MNC/SOC.MAT,soil pH,and clay content were identified as direct factors on FNC/BNC.Soil microbial necromass carbon(MNC)is an important contributor to soil organic carbon(SOC)and plays a vital role in carbon sequestration and climate change mitigation.However,it remains unclear whether the content,contribution to SOC(MNC/SOC),and fungal-to-bacterial necromass carbon ratio(FNC/BNC)of MNC vary across forest biomes and types.By summarizing data from 1704 points across 93 forest sites,we explored the spatial patterns of MNC,MNC/SOC,and FNC/BNC in the surface layer of 0–20 cm of forest soils,as well as the controlling factors involved.Overall,boreal and temperate forests had higher MNC and FNC/BNC values than tropical,subtropical,and Mediterranean forests,whereas both boreal and Mediterranean forests had low MNC/SOC values.Mixed forests had higher MNC and lower FNC/BNC than broadleaved and coniferous forests,whereas MNC/SOC was higher in broad-leaved forests than that in coniferous forests.Interestingly,the dependence of MNC on forest type also varies among forest biomes.Regression analyses identified soil total N as one of the most important factors affecting MNC and MNC/SOC;whereas MAT,soil pH,and clay content were identified as the important factors affecting FNC/BNC.This synthesis is critical for managing soil MNC to mitigate climate change in forests.展开更多
基金financially supported by the National Natural Science Foundation of China(42122054,42192513,and 42321004)Guangdong Basic and Applied Basic Research Foundation(2021B1515020082)+1 种基金Key Platform and Scientific Research Projects of the Guangdong Provincial Education Department(2020KCXTD006)Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control(No.2023B1212060002).
文摘Boreal and temperate forests had higher MNC and FNC/BNC than other forest biomes.Mixed forests had higher MNC and lower FNC/BNC than other forest types.The dependence of MNC on forest type varied among forest biomes.MAT and soil total N were the important factors on MNC and MNC/SOC.MAT,soil pH,and clay content were identified as direct factors on FNC/BNC.Soil microbial necromass carbon(MNC)is an important contributor to soil organic carbon(SOC)and plays a vital role in carbon sequestration and climate change mitigation.However,it remains unclear whether the content,contribution to SOC(MNC/SOC),and fungal-to-bacterial necromass carbon ratio(FNC/BNC)of MNC vary across forest biomes and types.By summarizing data from 1704 points across 93 forest sites,we explored the spatial patterns of MNC,MNC/SOC,and FNC/BNC in the surface layer of 0–20 cm of forest soils,as well as the controlling factors involved.Overall,boreal and temperate forests had higher MNC and FNC/BNC values than tropical,subtropical,and Mediterranean forests,whereas both boreal and Mediterranean forests had low MNC/SOC values.Mixed forests had higher MNC and lower FNC/BNC than broadleaved and coniferous forests,whereas MNC/SOC was higher in broad-leaved forests than that in coniferous forests.Interestingly,the dependence of MNC on forest type also varies among forest biomes.Regression analyses identified soil total N as one of the most important factors affecting MNC and MNC/SOC;whereas MAT,soil pH,and clay content were identified as the important factors affecting FNC/BNC.This synthesis is critical for managing soil MNC to mitigate climate change in forests.
